I have no objection to describing Mary as having been the mother of Christ, the mother of the Savior, the mother of Jesus, the mother of our Lord, or even the mother of the Son of God. Some of these are used in scripture. Some are not.
However, “Mother of God” is innacruate for the reasons I have already provided.
Further, there is an obvious effort to elevate and exalt Mary in a way she herself would find grievous.
Nowhere did anyone in the Bible bow to Mary or her likeness. When people wanted to bow to the apostles or make offerings to them, the apostles vehemently protested. When John was tempted to prostrate himself before an angel, the angel forbade him from doing so. Being a holy and godly woman, Mary would have done the same if it happened to her.
What did Christ say about the lofty position of His mother?
Mark 3:35
“For whoever does the will of God is My brother and My sister and mother.”
What did Christ say when a listener proclaimed how blessed Mary was?
Luke 11:27-28
“And it happened, as He spoke these things, that a certain woman from the crowd raised her voice and said to Him, ‘Blessed is the womb that bore You, and the breasts which nursed You!’ But He said, ‘Yes rather, blessed are those who hear the word of God and keep it!’”
Further, there is an obvious effort to elevate and exalt Mary in a way she herself would find grievous.
There is also an obvious effort to diminish Mary.
My purpose is not to elevate or exalt Mary; it is to try to understand how Mary can be the mother of Jesus and Jesus can be God, but Mary cannot be the mother of God.
If Mary is the mother of Jesus, it defies logic to say Jesus is God but Mary is not the mother of God. Either Jesus could not be God or Mary would have to be the mother of God. Yet you agree that Jesus is God in the fullest sense. Therefore, Mary must be the mother of God.